Q: In this task, you're given a context passage, followed by a question that needs to be answered. Based on the paragraph, you must write unambiguous answers to the questions and your answer must refer to a specific phrase from the paragraph. If multiple answers seem to exist, write the answer that is the most plausible.
The first step in taking the underground was determining where I  wanted to go. Then, I consulted Google maps on my phone. I opened the app and typed in my destination. I then selected the public transportation tab and pressed the navigate button. The app told me that I should take the red train to my destination. The station was just a couple of blocks away. I walked there and followed the instructions on the app as to which train to get (red train, northbound). I purchased a ticket at the ticket machine using my credit card. I scanned my ticket, then went through the turnstile. I followed the signs to the correct platform and waited a few minutes to for the train to arrive. When it got there, I waited for the people to exit the train before getting on. The app told me to get off after three stops. Once I got off, I followed the signs to the exit. 
Question: How many stops did they pass before they got to their stop?
A:
2